What are the reasons why a manual forklift cannot be lifted?

[DeLyla]

Reasons why a manual forklift cannot be lifted: lack of hydraulic oil; insufficient purity of the oil; the adjusting bolt is too close or the adjusting screw is too tight, keeping the valve in an open state; air in the hydraulic cylinder. Additional information: Forklift: A forklift is an industrial handling vehicle designed for loading, unloading, stacking, and short-distance transportation of palletized goods. The International Organization for Standardization (ISO/TC110) refers to it as an industrial vehicle. It is commonly used for transporting large objects in warehouses and is typically powered by a fuel engine or battery. Technical parameters of a forklift: The technical parameters of a forklift are used to indicate its structural characteristics and working performance. The main technical parameters include: rated load capacity, load center distance, maximum lifting height, mast tilt angle, maximum travel speed, minimum turning radius, minimum ground clearance, as well as wheelbase and track width.

[DelEmma]

I've been operating manual forklifts for many years and have encountered numerous lifting failures. The most common issue is insufficient or leaking hydraulic oil – if the oil level is low, the pump can't build pressure, making lifting impossible. Worn or damaged seals can also cause oil leaks, rendering the entire system ineffective. Overloading the forklift is another frequent cause, such as when the cargo exceeds the designed weight limit. Air entering the hydraulic system requires bleeding, otherwise the oil flow becomes obstructed. I've also experienced mechanical jams, like rusty handles or stiff joints. These all affect safety – a forklift failing to lift could drop loads and cause injuries. I recommend checking oil levels and handle smoothness before each use, and promptly repairing or replacing worn parts when issues are found to ensure operational efficiency.

[StEvan]

When I first started using a manual pallet jack, I encountered a situation where it just wouldn't lift, which was extremely frustrating. My supervisor taught me to check if the load exceeded the limit. If the handle isn't pressed all the way down during operation, the pump can't effectively lift the hydraulic oil. Issues like insufficient or contaminated oil, aging seals causing leaks are common, especially when working in dirty and messy environments where dust can accumulate inside the jack and clog the oil passages. Older equipment naturally wears out faster. I learned a handy trick: always perform a simple test before and after daily use, like manually pumping a few times and listening for any unusual sounds. This helps identify problems early and avoids work delays. Now, I always pay extra attention to these details when using the jack, developing good habits to prevent unexpected breakdowns.

[TheoRose]

From a mechanical perspective, the inability to lift a manual forklift primarily stems from hydraulic system issues. For instance, oil pump damage or clogged oil passages can prevent normal fluid flow, or air entering the system may form bubbles that disrupt pressure. Leaking seals can cause oil loss, while faulty valves may fail to open the pathway. Overloading can automatically trigger the safety valve to lock the operation. Simple checks include manually bleeding air or adding oil. Inadequate daily maintenance can lead to rust and jamming, compromising the forklift's lifespan and operational safety.